POST-LABORATORY QUESTIONS QUALITATIVE ANALYSIS OF ANIONS (Answer all of the foll

Question

POST-LABORATORY QUESTIONS QUALITATIVE ANALYSIS OF ANIONS (Answer all of the following questions in your own words. Turm in with the rest of lab manual). and 1. How can 6M nitric acid be used to identify co3 ions dissolved in the same solution with So utions? 2. How can you distinguish between SO and POi if they are present in the same solution? 3. What would you do and how would you know that a precipitate contained either AgCI, or Agl, or both? 4. Why should you test for the presence of NOj ions in a solution before testing for the presence of C and I-ions in that solution? 5. Why should a person not test for the presence of NO5 ions in a solution that he or she plans to subsequently test for the presence of sulfate ions, SO 14

Explanation / Answer

1)

Add some acid (HnO3, for example) tothe PO43-, CO32- and SO42- mixture. Formation of the gaseous CO2 is a good indication of carbonate.
CO32- + 2 H+ forms CO2 (gas) + H2O

2)

Add 1-2 mL of HCl solution and some BaCl2 to the PO43- and SO42- mixture. Formation of the white precipitate indicates the presence of SO42-.
Ba2+ + SO42- form BaSO4, it is white precipitate
PO43- (Phosphate) do not react in the presence of HCl

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